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Detroit 60 Series

Discussion in 'Ask An Owner Operator' started by Old Hullabaloo, Apr 20, 2019.

  1. Apr 20, 2019 #1
    Old Hullabaloo

    Old Hullabaloo Bobtail Member

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    I've got a 1994 Detroit 60 Series, 11.7L, and wondering what RPM is normal for running. It seems to like 1500. In 10th gear (I have a Super 10), I get a bouncing/rocking starting as low as 1300 RPM, maybe as a result of the engine lugging? (This is when unloaded.) I'm not sure what my rear diff ratio is.
     
    Old Hullabaloo, Apr 20, 2019
    Old Hullabaloo, Apr 20, 2019
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  3. Apr 20, 2019 #2
    mover man

    mover man Road Train Member

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    My 97 century 8 just keep it in the green zone on the tech. But if memory serves me right o would let it lug as low as 10. But 13-17 was normal operating range.
    1300 rpm = 55mpr
    1500 rpm = 65mpr
    1700 rpm = 75mpr
     
    mover man, Apr 20, 2019
    mover man, Apr 20, 2019
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  4. Apr 20, 2019 #3
    singlescrewshaker

    singlescrewshaker Road Train Member

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    You missed typed engine size. You have either a 11.1 or a 12.7.

    I've got a 9/92 build 11.1 series 60. It pulls good down to 1200, but as advised by long time detroit 60 owners, I no longer pull hard below 1400. Not lugging should help it live a longer life..
    I cruise anywhere between 1400-1750. Mine seems to like high revs, & still returns great mpg.

    If bouncing at 1300, I'd downshift immediately. That's still well within Detroit's operating range, & shouldn't bounce, or vibrate. I'm far from a mechanic but I'd start inspecting the engine mounts, trans mounts, drive line, & suspension. Something may be worn out.
     
    singlescrewshaker, Apr 20, 2019
    singlescrewshaker, Apr 20, 2019
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    Trucker186 and Old Hullabaloo Thank this.
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